A madame secretary -- debate the vice presidential debate last night. It was one thing that the vice president said it which was. That is what intelligence told us and this is one issue that seemed so. Very basic. And I'm finding it difficult to understand why it's not clear and that is whether or not -- -- was a demonstration. That night. Is there any clarity you have at this moment about. And then also could you tell us a little bit about what. You're dealing with an attack actually happen -- -- -- land -- see State Department official was mentioning that. -- back here in Washington was monitoring -- -- from that post. What was happening in real time could you tell us what you were doing were you watching you talking with -- and details. I think that. It is. Very important to. Recognize. That. We have an investigation going we have an accountability review board. That is just be getting. It's work. There is much we still don't -- and I am. The first to say that. But as someone who has -- epicenter of this tragedy from the beginning I do know this. There is nobody in the administration. Motivated by anything other. And trying to understand. What happens. And we are doing all we can. To prevent it from ever happening again anywhere. And of course we are as a government doing. What it takes to track down those who were responsible. To this day. To this day we do not happy complete picture we do not have all the answers. No one in this administration has ever claimed otherwise. Every one of us has made clear that we are providing best information we have. At that time -- that information continues to be updated. It also continues to be put into context and we're deeply understood. Through the process -- -- engaged in. Ambassador rice has the same information. From the intelligence community as every other senior official debt. And it and that's the very way that I'm you know answering your question today -- -- We can only tell you what we know. Based on our most current understanding. Of the attack and what led up to it. Obviously we know more as time goes by and we will know even more. Then we did hours and days after the attack. So. That's what investigative processes its. Designed to dues to try to sort through. All the information some of that contradictory and conflicting. And I want us to keep in mind. Four Americans were killed. Four men who served our country. Dozens of Americans fought for their lives. That night. And to honor them we all have to get to the bottom of every question and answer to the best of our ability. And then we've got to be sure that we apply the lessons we -- to make sure that we protect everybody in harm's way. So I'm going to be as I happen from the very beginning cooperate fully. At the investigations. That our ongoing because nobody wants to -- -- know more about. What happened in -- -- -- I know what I'm gonna leave itself.

This transcript has been automatically generated and may not be 100% accurate.

Now Playing: Russia Faces Increased Tensions With the West After Sending Troops Into Crimea